<template>
  <div class="child2">
    <h3>子组件2</h3>
    <h4>电脑：{{ computer }}</h4>
    <h4>哥哥给的玩具：{{ toy }}</h4>
  </div>
</template>

<script setup lang="ts" name="Child2">
  import { onUnmounted, ref } from "vue";
  import emitter from "@/utils/emitter";

  // 数据
  let computer = ref("联想");
  let toy = ref("");

  //给emitter绑定send-toy事件
  emitter.on("send-toy", (value: any) => {
    toy.value = value;
  });
  //在组件卸载时解绑send-toy事件    这步是为了不要占内存
  onUnmounted(() => {
    emitter.off("send-toy");
  });
</script>

<style scoped>
  .child2 {
    margin-top: 50px;
    background-color: orange;
    padding: 10px;
    box-shadow: 0 0 10px black;
    border-radius: 10px;
  }
</style>
